UNIQUENESS FOR SOLUTIONS OF NONHOMOGENEOUS A -HARMONIC EQUATIONS WITH VERY WEAK BOUNDARY VALUES

LetΩ be a bounded domain in Rn.We consid-er the quasilinear elliptic second order equationdiv A(x,u) =B(x,u) (1 )where A∶ Ω×Rn→Rn and B∶ Ω×Rn→R are func-tions satisfying the usual measurability conditions(Carathodory conditions) and,for1 0whenever h1≠ h2 (4)　　　 |B(x,h) |≤β|h|p -1(5)for almostevery x∈ Ω and all h,h1…     

青藏列车电力连接器绝缘问题及改进措施

对青藏客车电气系统在运用中出现的列车干线绝缘不良故障,通过深入的调研和分析,找出故障原因,并提出改进措施。     

沥青路面早期病害分析及处理措施的探讨

针对沥青路面早期病害的主要表现形式,介绍了相应的处理措施。     

浅谈涂装喷涂机器人换色系统及影响

从换色部件、换色程序等介绍喷涂机器人换色系统,并结合现场生产实际情况,总结分析换色效果影响因素,介绍换色产生的问题解决方案。     

Carpooling problem: A new mathematical model,branch-and-bound,and heuristic beam search algorithm

Carpooling is an environmentally friendly transportation system. It can efficaciously help resolve a variety of societal concerns of the urban areas, ranging from traffic congestion to environmental pollution. In this paper, we propose a new mathematical model to solve the carpooling problem. The model simultaneously minimizes the costs of travel times, the vehicle use, and the vehicle delays. An exact solution method based on Branch-and-Bound (B&B) algorithm is proposed to efficiently obtain the optimal solution of the problem. In order to find the near-optimal solutions for large-scale problems, a heuristic beam search algorithm is introduced, which is based on the partial relaxation of some fathoming criteria applied in our proposed B&B. The computational experiments are conducted, based upon the transportation network of Isfahan city, Iran. The results demonstrate the great capability of the proposed exact solution method in terms of both computational solving time required and the number of the evaluated nodes, in comparison with CPLEX software package. The findings of this research can be applied to solve the carpooling problem compatible to the real-life situations.     

城市轨道交通架空接触网电分段设置方案探讨

从设计入手,结合运营管理,针对城市轨道交通有渡线或存车线的车站架空接触网电分段设置方案的优缺点进行探讨和分析。     

郑西客专湿陷性黄土路基挤密桩施工特殊处理方法

郑西铁路客运专线大部分地段穿越湿陷性黄土区域，根据现场湿陷性黄土路基挤密桩施工经验，介绍饱和软弱土缩孔、桩底土质为软弱土、遇到地基土质较硬、地下洞穴及地下水渠等特殊情况的处理办法，为湿性黄土区域的挤密桩施工提供借鉴。     

拟线性Dirichlet问题的奇摄动

利用几个简单例子,阐述了拟线性D irichlet问题的边界层现象.     

一类带时滞的偏泛函微分方程周期解的存在性

笔者在本文对带时滞的偏泛函微分方程,u(t)=Au(t)+F(ut),就A是强连续半群T(t)的无穷小生成元,F是关于us∈C([一致Lip连续的情形,证明了其相应积分方程及微分方程周期解的存在性.?r,0],Xα)     

07MnNiCrMoVDR钢在硫化氢溶液中的腐蚀疲劳裂纹扩展速率数学模型

本文通过试验研究07MnNiCrMoVDR钢在硫化氢水溶液中的腐蚀疲劳裂纹扩展特性,根据试验数据,利用神经网络,以介质浓度、载荷频率、应力比作为输入节点,裂纹扩展速率系数C作为输出节点,训练该网络预测不同条件下的裂纹扩展速率.根据由神经网络所预测的数据找出这三个影响因素在裂纹扩展速率系数C中的关系表达式,从而回归出07MnNiCrMoVDR钢在硫化氢水溶液中的腐蚀疲劳裂纹扩展速率数学模型.